#21489B
Closest named color: Cobalt (#1E488F). oklch(42.4% 0.143 262.9), rgb(33, 72, 155).
Aa
White text reads best on this color (8.51:1).
About this color
#21489B is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.143 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.020 away. White text reads best on it, at 8.51:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.46:1 |
| White text | 8.51:1 |
Values
| HEX | #21489B |
| RGB | rgb(33, 72, 155) |
| HSL | hsl(221, 65%, 37%) |
| OKLCH | oklch(42.4% 0.143 262.9) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #21489B | 8.51:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #21489B | 2.46:1 | Fails | Lc 15.1 | Dividers and decoration only |
| #21489B text on white | 8.51:1 | AAA | Lc 88.8 | Fine for body text |
| #21489B text on black | 2.46:1 | Fails | Lc -13.4 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C9DAF9
oklch(88.5% 0.047 262.5)
-
Step 300
300
#A4C1F7
oklch(80.9% 0.083 262.6)
-
Step 400
400
#749FF4
oklch(70.8% 0.134 263)
-
Step 500
500
#5084EF
oklch(63.1% 0.17 262.9)
-
Step 600
600
#356BDE
oklch(55.7% 0.185 262.9)
-
Step 700
700
#2758C1
oklch(49.1% 0.173 262.9)
-
Step 800
800 (this color)
#21489B
oklch(42.4% 0.143 262.9)
-
Step 900
900
#203E7C
oklch(37.7% 0.111 262.8)
-
Step 950
950
#132548
oklch(27% 0.069 262.3)
#21489B with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #0B529E | 0.027 |
| Deuteranopia (no green cones) | #004799 | 0.019 |
| Tritanopia (no blue cones) | #005C6A | 0.112 |
| Achromatopsia (no color) | #4D4D4D | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21489B
#21489B
oklch(42.4% 0.143 262.9)
- #654900
#654900
oklch(42.4% 0.087 83.3)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #21489B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.020
- Dusk Blue #26538D ΔE 0.042
- Blueberry #464196 ΔE 0.046
- Sapphire #2138AB ΔE 0.047
- Light Navy #155084 ΔE 0.047
- Dark Slate Blue #483D8B ΔE 0.057
- Deep Sea Blue #015482 ΔE 0.059
- Twilight Blue #0A437A ΔE 0.060
Use #21489B in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.